Answers

  • qais
  • Content Quality
2016-01-24T21:45:28+05:30

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sin3x = 3sinx - 4sin³x
          =3×1/6 - 4×(1/6)³
          =1/2 -4/216
          =1/2 -1/54 = 26/54 = 13/27
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Why sin3x=3sinx-4sin^3x?
you can proof this as sin3x= sin(2x+x) =sin2xcosx +cos2xsinx
and sin2x= 2sinxcosx and cos2x= 1- 2sin^2x
hope now you understand the derivation :)
  • CMG
  • Helping Hand
2016-01-25T21:55:01+05:30
Sinx=1/6 sin3x=3sinx_4(sinx)cube
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